MP881W Modem User Guide
58
2130808
Digital output devices
Digital
output
devices
are
those
that
have
only
two
states
and
the
state
is
controlled
by
a
signal
from
the
MP
modem.
Any
device
that
is
to
be
switched
on
and
off
from
3G
Watcher
would
be
installed
as
a
digital
output
device.
A
digital
output
can
be
connected
to
two
of
the
pins
on
the
DB15HD
connector:
Pins
3
and
11.
(These
can
be
used
for
either
input
or
output.)
Note: Before using the input/output lines, you must configure them as
inputs or outputs.
Typically
a
digital
output
device
should
be
connected
between
Ground
(pin
10)
and
the
output
port
(Pin
3
or
11).
Figure 7-3: Wiring for using Pin 3 (digital output) as an electronic switch. Pin
10 is Ground.
The
digital
I/O
ports
provide
open
‐
collector
output
to
a
maximum
of
500
mA.
Analog input devices
Analog
input
devices
are
those
that
generate
a
signal
of
varying
voltage,
based
on
the
state
of
an
instrument
or
gauge.
An
example
of
an
analog
input
device
might
be
a
sensor
that
detects
the
vehicle’s
speed.
An
analog
input
can
be
connected
to
four
of
the
pins
on
the
DB15HD
connector:
Pins
7,
8,
14,
and
15.
Содержание MP 881W
Страница 1: ...MP 881W Modem User Guide for AT T 2130808 Rev 1 4...
Страница 2: ......
Страница 6: ...MP881W Modem User Guide 6 2130808...
Страница 12: ...MP881W Modem User Guide 6 2130808...
Страница 24: ...MP881W Modem User Guide 18 2130808...
Страница 42: ...MP881W Modem User Guide 36 2130808...
Страница 52: ...MP881W Modem User Guide 46 2130808...
Страница 58: ...MP881W Modem User Guide 52 2130808...
Страница 68: ...MP881W Modem User Guide 62 2130808...
Страница 76: ...MP881W Modem User Guide 70 2130808...
Страница 86: ...MP881W Modem User Guide 4 2130808...
Страница 87: ......
Страница 88: ......
